Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
155/70r14 vs 175/70r14 Tire Comparison Side By Side
  155/70-14 175/70-14 Difference
Diameter inches (mm) 22.54 (572.6) 23.65 (600.6) 1.1 (28) 4.9%
Width inches (mm) 6.1 (155) 6.89 (175) 0.79 (20) 12.9%
Circum. inches (mm) 70.82 (1798.88) 74.29 (1886.84) 3.46 (87.96) 4.9%
Sidewall Height inches (mm) 4.27 (108.5) 4.82 (122.5) 0.55 (14) 12.9%
Revolutions per mile (km) 894.64 (555.9) 852.93 (529.99) -41.71 (-25.92) -4.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.98 mph (33.76 km/h)
25 mph (40.23 km/h)26.22 mph (42.2 km/h)
30 mph (48.28 km/h)31.47 mph (50.64 km/h)
35 mph (56.33 km/h)36.71 mph (59.08 km/h)
40 mph (64.37 km/h)41.96 mph (67.52 km/h)
45 mph (72.42 km/h)47.2 mph (75.96 km/h)
50 mph (80.47 km/h)52.44 mph (84.4 km/h)
55 mph (88.51 km/h)57.69 mph (92.84 km/h)
60 mph (96.56 km/h)62.93 mph (101.28 km/h)
65 mph (104.61 km/h)68.18 mph (109.72 km/h)
70 mph (112.65 km/h)73.42 mph (118.16 km/h)
75 mph (120.7 km/h)78.67 mph (126.6 km/h)
80 mph (128.75 km/h)83.91 mph (135.04 km/h)
85 mph (136.79 km/h)89.16 mph (143.48 km/h)
90 mph (144.84 km/h)94.4 mph (151.92 km/h)
95 mph (152.89 km/h)99.65 mph (160.36 km/h)
100 mph (160.93 km/h)104.89 mph (168.8 km/h)

Gear Ratio / RPMs for New Tire (@ 65 mph)
2.35 2.73 2.94 3.07 3.21 3.31 3.42 3.55 3.73 3.91 4.11 4.27 4.56 4.88 5.13 5.29 5.38 5.71 6.17 7.17
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